I noticed that you took the Manhattan CAT's. I would suggest that you generate the assessment reports of all your tests and analyse them. On how to analyse:http://www.manhattangmat.com/articles/analyze-practice-problem.cfm might help.The assessment report does some of the analysing for you topic wise for both quants and verbal. I would suggest that you could find out what kind of mistakes you make in the different sections. Rank them in order of how commonly these topics are tested on GMAT and how long it would take for you to fix them.Fix the ones you can easily correct first. Avoid worrying about scores,and only look at getting strong in the commonly tested topics.
For RC, this is the technique I used:
Read passage sentence by sentence.
Pause after each sentence to understand meaning.
When I read the next sentence i would map on how it added to the previous sentence.
I would also pause at end of each paragraph to understand its general context.
RC main purpose - eliminate all choices which don't deal with RC's main topic.This brought me down to 2 good choices,which sounded equally good. I would if all paragraphs of the RC dealt with the answer choices.I eliminated the one which didn't.
RC inference - similar technique for CR inference. Go back to passage and see if answer choices tie back to it.If it doesn't eliminate it
RC specific detail - After reading question,go back to passage and read a sentence above,the sentence mentioned,and a sentence below it to make me understand context.Eliminate answer choices after this.
RC strengthen/weaken - similar technique for CR strengthen/weaken
RC tone - eliminate choice which are incorrect if they do deal with RC topic. Then look at RC tone - no opinion,positive opinion or negative opinion.Eliminate based on this.
For CR & RC I learnt to be wary of extreme words - all,most,only,none. Answer choices like these are correct only if backed by the passage. GMAT traps are common with plays on these.
I did the e-gmat
SC course and it helped me quite a bit.After doing the course I did OG 13
SC questions and analysed them. If SC concepts is not your problem,then I suggest that you just analyse your SC on manhattan CAT's. I noticed that even though I knew the concept of pronoun precendents I would forget to check them in SC.It was easy to avoid this once I discovered I was prone to doing it.
For quants,similar analysis would help. And you are the best person to do it,since you know what you are strong in,and weak in.
All the best and hope this helps!
My debrief - my-gmat-story-690-12-27-q-44-v-40-from-390-q-21-v-144885.html
My debrief- For people out of touch with exams http://gmatclub.com/forum/my-gmat-story-690-12-27-q-44-v-40-from-390-q-21-v-144885.html
My blog -http://vandyuncensored.blogspot.in/2012/12/my-gmat-story-690-1227-q-44-v-40-from.html